Helmet cover



FIG. 1 is a left side view of a helmet cover illustrating how it fits over a helmet;

FIG. 2 is a front perspective view with the ear flaps down;

FIG. 3 is a right perspective view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a front view thereof;

FIG. 8 is a rear view thereof;

FIG. 9 is a right side view with the ear flaps down;

FIG. 10 is a left side view with the ear flaps down;

FIG. 11 is a front view with the ear flaps down;

FIG. 12 is a rear view with the ear flaps down; and,

FIG. 13 is a top view with the ear flaps down.

The details shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a helmet cover, as shown and described. 